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Kinematic Analysis Of Ductile Features Within The Northern Wenatchee Block, North Cascades, Washington, Gerald Griesel
Kinematic Analysis Of Ductile Features Within The Northern Wenatchee Block, North Cascades, Washington, Gerald Griesel
WWU Graduate School Collection
The Cascade crystalline core of Washington State is a block of high grade metamorphic and plutonic rocks at the southeast end of the Cretaceous-Tertiary Coast Plutonic Complex. Previous workers have debated whether northwest translation or southwest-vergent thrusting was responsible for regional metamorphism and deformation. The present study finds structural evidence supporting both orogen-normal and orogen-parallel displacements, thus indicating that the regional deformation can be broadly characterized as transpressional.
Units of the study area include: 1) the Napeequa schist, derived from an ocean floor protolith, and 2) an accreted Triassic arc, which includes the Marblemount Meta Quartz-Diorite (MMQD) and metamorphosed volcanic …